I understand what you're saying, however the modifications I made do not show up fully until I go to 1.0 on the dials.  The head begins to "grow" as soon as I start turning the dial.  

So to elaborate, eg. I pose a head with expressions and such (as close to what I'm looking to create).

Export the head as morph target.
 
Import into zbrush, increase say, just the size of the cheeks.

Export from Zbrush, re-import into poser.

Turn the dial say to .2 - it is at that point that the entire head begins to increased in size.

Funny, this never happens when I'm tinkering but when I have a project due, it always happens.

btw, I understand the mesh import method -  I've used both the polymesh tool and regular import method and both have the same results.  Although I agree the the polymesh tool is the absolute best way to go because you can subdivide the mesh (I love you zbrush) without issue.

I suppose I can exaggerate my mods in zbrush and that way, I only need to change the morph dial a small percentage but it just seems odd when typically (with other morph targets) 1.0 represents the target morph.

You guys are cool btw.